Thread-stitching machine for bookbinding.



U. BISCHOF.

THREAD STITCHING MACHINE FOR BOOKBINDING.

APPLICATION man JUNE 3. 1915.

1,217,395. Patented Feb. 27, 1917.

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-U. BISCHOF.

THREAD STITCHING MACHINE FOR BOOKBINDING. APPLICATION HLED JUNE 3. 1915.

1,217,395, Patented Feb. 27,1917.

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ULRICH BISCHOF, 0F WINTERTHUR, SWITZERLAND, ASSIGN'OR TO GEBR. STAUBLI,OF

I I-IORGEN, SWITZERLAND.

THREAD-STITCHING MACHINE FOR BOOKBINDING.

Specification of Letters Patent.

Patented Feb. 27, 1917.

Application filed June 3, 1915. Serial No. 31,962.

To all whom it may concern:

Be it known that I, ULRICH BISCHOF, a citizen of the Republic ofSwitzerland, residing at lVinterthur, in the Canton of Zurich, Republicof Switzerland, have invented certain new and useful Improvements inThread-Stitching Machines for Bookbinding; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in-the art to which it appertains tomake and use the same, reference being had to the accompanying drawings,and to letters of reference marked thereon, which form a part ofthisspecification,

My invention relates to thread-stitching machines for book-bindinghavinga reciprocating eyed needle, a reciprocating hooked needle to passthe needle thread through the sheet and a thread layer passing from oneneedle to the other and vice-versa. When such a machine works, the eyedneedle penetrates in its downward stroke the sheet to be stitched,whereupon the thread-layer seizes the thread and carries it to thehooked needle which in its upward stroke raises the thread loop andcarries the same through the thread loop belonging to the previouslystitched sheet and surrounding the hooked needle. In this kind ofmachines the driving shaft carrying the cam disks is placedhorizontally, as it is known, and the cam disks are arranged on both thesides of the frame of the machine in such a way, that all the workingmovements arederived from these cam-disks by means of levers and longconnecting rods. It is evident that these machines cannot work with ahigh number of revolutions, since the large levers sling and the longconnecting rods laterally dc.- flect, so that they do not exactlyexecute the movements as intended by the cam-disks. As a'result of theseinexact working movements, the loops are formed irregularly or misstotally, so that stitches will be omitted.

Also the pricking motion does not surely work, because the lever and therod connecting the latter to the prick-punch laterally deflect, so thatthe prick-punch does not sufficiently prick the holes in the sheet to bestitched and the upper needles when entering into the sheet often break05. Also in the take-up motion the lever and the connecting rodslaterally deflect, so that the stitch will not be tightened uniformlyand sufiiciently. Machines of the type as above described havinga largenumber of levers and long connecting rods are very complicated andexpensive.

In another type of thread stitching machines the movements are directlyderived from large cam disks arranged on both sides of the machine whichcam disks have very steep cam grooves. These machines can only work witha low number of revolutions, because the connections by virtue of thesteep cam grooves deflect and vibrate.

All these disadvantages are overcome by the improved machine which is ofvery sim ple construction andpermits to work with a high number ofrevolutions increasing thus the output. p t

A structure embodying my invention and illustrating the principlesthereof is shown in the accompanying drawings and will be hereinafterfully described and referred to in the appended claims.

Figure l is a side view and Fig.2 a front elevation of the machine.

The machine as shown in the drawing works with an eyed needle and ahooked needle. By means of this pair of needles thesheets are onlystitched at one place, but two or more pairs of needles may be used forstitching large sheets.

' From the base 1 rise two lateral standards 2 and 3. The standard 2 haslateral brackets in which a vertical shaft 4 is rotatably journaled. Theshaft 4 carries a cam 5 driving the prick-punch 6, a cam 7 driving thetakeup 8, a cam 9 driving the thread clamp 10 and a cam 11 driving theeyed needle 12 and the hooked needle 18. All these cams are mounted uponthe vertical shaft 4 in next proximity of the respective working membersto be operated and at the same height as the carriers of these members.Two arms 14 and 15 mounted upon the horizontal shaft 16 carry theangular table 7 2, 7 3 upon which cured to a plate 27. This plate issupported by two rods 23 and 29 axially movable in eyes 30, 31, 32 and33 of the arms 14 and carrying the table. Cross pins 34 and 35 are fixedupon the rods 28 and 29 and engaged by the forked ends of the levers 36and 37 fixed upon a shaft 38 journaled in the arms 14 and 15. A thirdlever 39 mounted upon the shaft 38 carries a pivot 40 and also anantifriction roller 41 actuated by the cam 5.

A second cam 42 fixed upon the vertical shaft 4 actuates thethread-layer 43 secured to a plate 44 axially movable and guided in thearms 14 and 15. The plate 44 has a transverse bearing 45 in which aroller 46 pivoted at the free-end of the cam lever 47 engages. Anotherroller 48 also carried by the lever 47, but nearer to the axis of thelever 47 enters in the curved. groove of the cam 42 so that therotations of the cam are transmitted to the lever 47 and consequentlythis lever imparts sliding movements to the plate 44 by means of theroller 46 and the bearing 45. A horizontal shaft 49 journaled in thestandards 2 and 3 carries two levers 50 and 51 supporting the take-up 8formed by a rod, which cooperates with a stationary rod 52 around whichthe stitching thread is passed, in order to be taken up by the rod 8. Athird cam 7 secured to the vertical rod 4 acts upon the roller 54 of acam lever 53 fixed upon the shaft 49.

Another horizontal shaft 55 journaled in the standards 2 and 3 carriestwo levers 56 and 57. These levers embrace cross-pins 58 and 59 fixed tothe guide rods 60 carrying the sewing-needle-device. The rods 60 areguided in brackets 63 and 64 screwed to the standards 2 and 3. Thesewing needle 12 is screwed to the sewing-needle-device while a sleeve65 carrying a toothed pinion 66 is rotatably arranged on the saiddevice, in order to turn the hooked needle in a known manner. A fourthcam 11 fixed upon the upper portion of the vertical shaft 4 acts uponthe antifriction roller 68 of a cam-lever 67 secured to the shaft 55. Afifth cam 9 fixed upon the vertical shaft 4 acts upon a roller 71 of acam-lever mounted upon a horizontal shaft 69 journaled in the brackets63 and 64. This shaft carries the thread clampingarm.

The machine as above described operates as follows:

The sheet to be stitched is laid upon the angular table 72, 73 when itis moved into the extreme outer position whereupon the table with thesheet is swung inwardly under the needle-plate 74 of the machine. Inthis position the prick-punch 6 pierces a hole in the sheet into whichthe sewingneedle 12 with the thread and the hooked needle 13 with thehook directed forwardly and carrying ga loop enter afterward. Thereuponthe thrcadlayer 43 is moved toward the left, see Fig. 2, so that thebeak of the thread layer seizes the thread loop of the needle 12 andbrings the same before the hooked me dle 13, which in the meantime hasmade half a revolution. The hook therefore is directed rearwardly. Whenthe needles rise the thread brought on by the thread layer is seized bythe hooked needle and the new thread loop is passed through the loopsurrounding the hooked needle and belonging to the previously stitchedsheet without taking along this loop. After the needles having reachedthe highest position, the hooked needle will again be turned for half arevolution, so that the hook is again directed to the front of themachine.

During this operation the thread is taken up and tightened by the actionof the takeup 8. The thread clamp 10 releases the thread in the exactmoment and clamps it again.

It will be seen that the driving of the dill? ferent working memberstakes place in a vertical plane put in the axis of the driving shaft 4and that too only from one side of the machine, so that there is notendency to distort the driving shaft. Transmitting elements liable tobe strained, long levers and large complicated cams having grooves arealso avoided. The vertical driving shaft delivers its motion to thecarriers of the working members to prick the sheet to form the stitchesto tighten the thread and to i am or clamp the same by means of simplecams and levers near these carriers and at approximately the same heightas said carriers. This construction permits a very accurate and sureworking of the motions even with a high number of revolutions, so thatthe output of the machine will be considerably increased and all theaforesaid disadvantages overcome. The structure of the machine isextremely simplified, so that the costs of the construction areconsiderably reduced.

lVhat I claim is:

1. The combination in a thread-stitchingmachine for book-binding, amovable table, working elements comprising an eyed needle, a hookedneedle, a thread layer moving to and fro between these needles, aprickpunch, a thread-clamp, a take-up, a vertical shaft, carriers forsaid elements, cams secured to the vertical shaft near the carriers Q ofthe said working elements and at approximately the same height as thesaid carriers, small levers to transmit the movement of the cams to thecarriers of the working members, means to drive the vertical shaft andmeans to bring the table in and out of the operative position.

2. The combination in a thread-stitchingmachine for book-binding, aswinging table, two arms carrying the table and fixed upon a horizontalshaft, two cam-disks fixed upon 13o another horizontal shaft andactuating tWo levers fixed upon the first named horizontal shaft tobring the table in and out of the operative position, Working elementscomprising an eyed needle, a hooked needle, a thread layer moving to andfro between these needles, a priclepuneh, a thread-clamp, a take-up, avertical shaft, carriers for said elements, cams secured to the verticalshaft near the carriers of the said Working elements and atapproximately the same height as the said carriers, small levers totransmit the movement of the cams to the carriers of the Workingelements and means to drive the vertical shaft.

In testimony whereof, I have signed my name to this specification.

ULRICH BISCHOF.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). G.

